This depends on the country you reside in, your car's charging capacity, and the charging station you're using.

The average electricity fee is about $0.12 per kWh in the U.S (consumer rate). Let's say your electric car has an empty battery and approximately 60 kWh capacity. Depending on your driving style, your car should be able to reach approximately 100 to 200 miles on a single charge. Charging your electric car would cost a total of 60 x 0.12 = $7.20. This means that the power consumption per mile is just around $0.04-0.07.

Charging at an EVBox charging station
The charging station owner can set up her/his own charging fees. This may include a start rate, a time rate (rate per minute) and a kWh-rate. These rates will be visible to all charging station users via the service provider's app. Each service provider can define its own upcharge. They are also allowed to make individual agreements with their own customers about their charging rates and charging plans. The charging point operator does not have control over this agreement.